While baking a casserole, the oven shut off with the display showing "PF" and the next display was "loc". The diplay works as do the gas burners. I understand that "PF" means power failure but can't find the source of the problem.

Try a GE Control Panel Reset

This should clear the error codes:
Power off the unit, wait 5 minutes then restore the power.
Press the broil and bake keys simultaneously and "SF" will be displayed.
Press "Hr. Down" and "Minute Down" keys simultaneously for 3 seconds, then the time of day will be displayed.
Press "Temp Up" and "Minute Up." The control panel will display the following:
Go blank briefly
Display all segments briefly
Display "LOC REF" briefly
Display all segments again for 30 seconds
Display "LOC REF"
Acknowledge the "LOC REF" by pressing the "Hour Down" and "Minute Up."
Test control pads. Oven should now function.

Main mother board is going bad! Had this happen to mine too!!

PF stands for power failure you are loosing incoming power power check the terminal block the control will do goofey thing with loss of voltage rule of thumb no more than a 10% voltage loss 108VAC minuim

If you have a power failure or a brown out, it sends a very powerful current through the unit. Please keep in mind that these units are not protected against any surges. If you have a display, that means you have power. Unfortunately, the clock/timer contains relays that control the elements, the oven, etc. You will need to replace the clock to get it running again.

From a google search the following is copied:

LOC is a control panel lock not a door lock, see below.

The Control Lock shuts down the control panel pads to prevent
unintended use of the ovens.
When the control is locked, only the CLOCK, TIMER SET and
TIMER OFF pads will function.
The Control Lock is preset unlocked, but can be locked.
To Lock/Unlock Control: Before locking, make sure the ovens,
Timer and Timed Cooking are off. Press and hold START/ENTER
until a single tone sounds and "Loc," a picture of a lock and
"START?" will appear on the oven display, about 5 seconds.
Repeat to unlock and remove "Loc" from display.

If the above does not work have you tried removing power from the uit for a few minutes to see if it will reset.
________________

http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/499415-whirlpool-double-oven-shows-loc-display.html

Long shot...but perhaps the door sensor is not working well....try playing with the latch, and using a penetrate oil on the door latch.

the control board is bad,replace it there is no sequence to rectify this problem the board is bad

Could that be PF power failure 5AB in the Sabbath mode. That's a new one.
Your model number is useless. Sears has a big 3 digit product code followed by 8 digits.
But let me dig up my 5AB notes:

Here is what I have:

To
provide sabbath feature (or to cancel this setting):
1. Push the PREHEAT pad and set the oven
temperature to 500°F/260°C or more using the UP
ARROW pad.
2. Push the PREHEAT pad within the next 2 seconds
for 3-4 seconds. A beep sounds and a number
appears in red to the right of the display. For the
conversion, "3" must be displayed. If another number
is displayed, push the PREHEAT pad and select
"3".
3. Push the UP or DOWN ARROW pad to change
from 12 hour to 9999 in the display, for no 12 hour
shut-off.
4. Push the CANCEL pad to confirm your choice.

Other Displays:
When proceeding through steps 1 and 2 in the
Temperature Scale Conversion or in the elimination
of the Sabbath feature /12-hour Shut-off time limit,
two other words can be seen in the display. One is ESC
with O in red. It cannot be changed. The other is USE or
SALE with 3 in red. This one is for factory use and should
stay on USE.
Hope this helps


If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Unplug the power cord for few minutes. then plug it back to see if the light still keep coming.
then do this:
Check if you have it in the lock mode.
Press bake and broil pads together for 2 to 3 seconds until SF shows in the display.
Press the self clean pad, display will show loc off or loc on.
Let me know if it clear the fault.
Good luck from : Prince P

I am quoting above because I really need help. "When I push any of the function buttons on the oven console (Timer, Bake, Broil, Clock) the display shows 0FF in red next to the clock. The oven will not turn on and the timer will not work. I can not find any troubleshooting information on this problem. The oven is a model RDDS30V. Any help would be greatly appreciated!"